Yoke for converting motion



(No Model.)

M SCHULTZ.

YOKE FOR CONVERTING MOTION. No. 252,905. Patented Jan. 31,1882.

arts STATES MICHAEL SCHULTZ, OF CINCINNATI, OHIO.

YCKE FOR CONVERTING MOTION.

SPECIFICATION forming part of Letters Patent 'No. 252,905, datedJanuary 31, 1882.

Application filed July 14, 1881.

To all 107mmv it may concern:

Be it known that I, MIoHAEL SCHULTZ, a citizen of the United States, residing at Cincinnati, Hamilton county, Ohio, have invented new and useful Improvements in Yokes for Converting Motion, of which the following is a specification.

My invention relates to yoke devices employed in steam-pumps and similar constructions for converting reciprocatory into rotary motion, or vice versa, its object being to improve the construction and economize the cost of such devices, particularly those in which a roller is employed in place of the sliding box.

To this end my invention consists in the construction ot'an open block of peculiar form, to be interposed between the yoke-faces, which block, when in position, serves to hold the two members oftheyoke more aecuratelyand firmly in position together. The block also serves to forma cage or guide for the roller, and, in connection with the lower face of the yoke, an oiltrough for the lubrication of the roller.

It consists also in the combination, with the block and the members of theyoke, of removable plates for facing the wearing-surfaces of the yoke.

My invention is embodied in mechanism illustrated in the accompanying drawings, in which Figaro 1 is a side elevation of a yoke with my invention complete. Fig. 2 is an end elevation of the same yoke. Fig. 3-is a plan view of the block detached. Fig. 4. is a vertical longitudinal section of the block, and Fig. 5 is a vertical cross-section ot the block.

Similar letters of ret'erence'im'licate similar partsin both specification and drawings.

Referring to the drawings, the box in w hich my invention primarily resides is designated by the letter A, whileB B indicate the upper and lower extensions of the piston or rod, between which the yoke dcvice is interposed,

- I) Z) being the cross-heads, formed upon or connected with the pistonsB B, and constituting the upper and lower members proper of the yoke, between whose parallel faces the roller C (or sliding box where such is used) reciprocates.

In the ordinary construction of the yoke, when made in two parts, it is either divided in (No model.)

one entire block, A, extending the full length of the yoke. The block may be described as a rectangular box, open at the top and bottom, having thickened end walls, a a, connected by side walls, 0 c, the latterbeing also perforated by corresponding longitudinal openings to permit thelateral reciprocation oftheeran'k-pin p. The interior space between the end and side walls is left entirely open, and in this space the roller 7, or sliding box, reciproeates upon the parallelfaees of the yoke members I) I). The parts of-the yoke are held together by bolts d [Z passingthrough the ends of the members I) b and the end walls, a a, of theiuterposed box A in suitable perforations. One advantage otlhis construction is that the yoke box A. may be cast into farm and its upper and lower sides dressed parallel with absolute accuracy at one operation, while the pistons B B, with their yoke members I) b, may also be conveniently finished with equal accuracy and convenience in the lathe at one operation,

so that when the parts are bronght'together the bolt-holes maybe drilled in one operation, and the yoke, when fitted together, forms a tirm and perfectly aligned structure incapable of being weakened or its alignment disturbed by any strains.

Lost motion caused by wear of the faces of cured to me by former Letters Patent; butthe present construction is an improvement in respect to economy and ease of construction and repairs.

I also employ, in connection with the box A, facing-plates h h, of steel, gun-metal, or in some cases of rawhide or wood, for the faces of the crossheads b b, which plates are also, independently considered, covered by former Letters Patent; bpt the presentconstruction is also an improvement, since I cast the blocks with open recesses c e at the upper and lower sides of the block, which can be mueh'more accurately and easily fitted to the plates than apertures through solid ends of a yoke, and the plates can be far more easily removed and replaced, because in removing the bolts cl all the holding parts oi the yoke are loosened; and for the same reason the plates are more firmly held in position when the bolt-nuts are tightened.

The side walls, 0 c, may have shallow flanges projecting inwardly above and below, as indicated atff, Figs. 4 and 5, as a means of retaining the roller in the box A. This construction, however, is only practicable when plates such as d d are used or a corresponding raised surface left on the facesof the cross-heads I) I). In this case the upperflanges are cut away at the center, as shown at 9, Figs. 3 and 4, to permit ot' placing the roller in the box, which will be securely retained therein when the yoke is put together.

Instead of boring through the walls a a for the bolts, open recesses may be cast at the outer ends'pf the block A.

Having described my invention, I claim and desire to secure by Letters Patent 1. A yoke for converting rotary into reciprocatory motion in steam-pumps and other machinery, in which a box or open block, A, extending; the full length of the yoke, is interposed between the parallel faces of the crossheads and held by the connecting-bolts securin; the cross-heads, substantially as set forth.

2. In combination with the members b b of a yoke, the box A, constructed as described, having thickened end Walls, through which pass the retaining-bolts, and side walls, longitudinally perforated for the play of the crankpin, substantially as set forth.

3. The members I) b of the yoke, in combination with the box A, bolts (1 d, and facingplates h h, as and for the purpose set forth.

4. The members I) b of the yoke, in combination with the open box A and the roller (1, substantially as specified.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

MICHAEL SCHULTZ.

Witnesses:

O. .P. DOOLIT'ILE, L. M. Hosea. 

